Best 4-5 speed for this application?

I'd give a TKO 600 a second look, will handle the torque and can be had with a center shifter location for more comfort.

 

We have thought about that one too, just waiting to see how the budget pans out.

 

IMHO, if budget is an issue, then the A-833 is your best choice. If you need an example of how much abuse they can handle check out some of the nostalgia SS races.
Unless I am mistaken, the TKO type units are $$$$$.

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I'm looking at those on Brewers Performance. What ratio would be best? http://brewersperformance.com/products.asp?cat=87

 

Ratios are a personal choice IMO.
I'd suggest looking around and see if you can find one at a swap meet or in craigslist as a starting point. Once you have the adapter, flywheel and bellhousing then swapping to another A833 is a simple task so if you like the ratios in the first trans you can keep it or, if needed, buy a new one.

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Alright. Also, 18 or 23 spline? The 18 is stronger, and I don't know much about 354's, but I wouldn't expect to see torque over 500 ft lbs. Will the 23 spline be alright?

 

Anyone have any experience with one of these?

http://www.waldenspeedshop.com/legend.html

 

Little out of the budget on that one haha

 

The 23 spline was standard on all B-RB cars except for the 440-6 and 426H. I think you'll be OK....

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Alright, looks like the A833 is the best choice so far. Dad likes to save money anywhere he can so that may be the one we get.