Maybe. Need more info do you carry rear p***engers? Fenders? Mounted angle of shocks? What were the old ones? Use them over on the new ones. Shock length?
Check this out. Plus there is a bit more info at Speedway if you search on coil overs. http://static.speedwaymotors.com/images/charts/how-coilovermount.gif
A model A rear spring will solve this in a hurry, My 29 with a 425 Buick Turbo 400 and Champ Q/C does just fine on an A spring?
Go with the Carrera Coil overs from Speedway, they are made by QA1 and are very reasonably priced. I would go with 200-250 Depending on the Angle you end up mounting them at.
I called QA1 tech, gave them total weight of car (4000 lbs) and my engine (392 Hemi). They recommended 250 rate. I ordered, installed, and completely satisfied. (NOTE, this for front only)
QA1 makes a great progressive rate spring it works great for my p/u and also my buddy's Anglia drag car.
I put Afco coilovers on the rear of my highboy A Tudor, 250 lb springs, because it was to be full fender. I have the battery and 18 gallon fuel tank in the rear. In my opinion, my rear springs are a little to stiff. I probably need to be at 200 or 225 rating.
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