need to git it going the best 1/4 mile time on motor is 12.48 at 108mph that 346 just is not working if it will not work out i have a 400 low block sitting in the shop..71 deman is more were my car needs to be...anny ideas on rear shocks?
The car isn't faster because of the combination of parts used on the engine and chassis is not working together. Machine work and "tune-up" can be off also. Putting a bigger engine weighing 50-100 lbs more isn't going to help things either and will cost extra money to change over - big block trans housing, mounts, maybe radiator. There are 340's and 360's with milder engine combinations well into the 10's.
It's not easy or cheap, but sorting out the entire car is what's needed. Unfortunately, we can only help so much over the internet.
Suspension is the first thing that needs attention.
