I'm trying to help out a friend's son who is inheriting his dad's chevy truck. His dad wasn't very mechanical so paid a 'friend' to build it for him who was a decent mechanic but a piss-poor fabricator. Unfortunately, Dad passed less than two weeks after it was 'completed'. During the trucks construction I tried to steer the dad towards some different parts selections but not with much success, so there are more than a few bits that aren't really compatible with the 'finished' build (great guy, but a bit stubborn...). The son isn't particularly mechanical either, but says he has friends that could help him but they aren't the hot rod type. I believe I've found solutions for most of what needs fixing, but confess being a Ford guy I'm a bit stumped on the alternator mount. Dad insisted on early double-hump heads but they have zero tapped mounting holes in the end of the head so that prevents using a OEM-type mount. The current mount is off a 'L' bracket attached to the exhaust manifold, but the alternator interferes with the inner fender. Can't go low because of the frame/fuel pump. I found this.... SBC Alternator Bracket - for Double Hump Heads (bolts to water pump on – ICT Billet but it may be too low too. Any other suggestions?
Check if it has a long or short pump to be sure your choice of mount is compatible. Alan Grove has a wide variety of mounts. Don't forget about pulleys.
Hoo boy, I went thru this last year. stirred up the dust. These guys have got you covered, as in early double hump heads would normally indicate a short WP, but you need to confirm. Also Alan Grove had the best site for finding a good setup. The mess I made. https://www.jalopyjournal.com/forum/threads/sbc-long-to-short-water-pump.1319981/
This looks like an Alan Grove bracket but I don't know for sure. It comes off the water pump and mounts to the manifold.
Maybe consider running a Kabota or little John Deere alternator. If there are not a lot of accessories it will keep up. Guys use them on race cars.
Another vote for "pics will help" We can't see what you're working with, so it's really hard to make an exact recommendation. if it's too off topic for pics here, you can put it on the off topic forum
https://www.summitracing.com/parts/trd-9254/make/chevrolet https://www.summitracing.com/parts/sum-g4050/make/chevrolet https://www.summitracing.com/parts/spe-42263/make/chevrolet I've used these three piece chrome brackets and arms for every SBC build I've ever done. The mounts allow the bracket to be moved forward or back for either water pump type, and they are universal for left or right side mounting. The arm can be bent to an offset easily to align with wherever the alternator sits and it bolts to the top water pump bolt on either side.
Drill and pipe tap the head 1/8 npt. Then make up a custom stud 1/8 npt one end then 3/8-16 on the other end. Worried about the head? Put a pipe plug in it then put it on the drivers side later on down the road.
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