Stroker Smallblock cost
64 cuda is working from the early A Body and will face different problems than the later larger cars. The biggest one is getting the engine to breath.
408 Duster nailed it:
The 1 5/8" hedman headers were a huge bottle neck. learned that after switching to Hooker 1 3/4" jobs 2 years ago.
That doesnt mean you cant build a great performing car, the early A Body cars are lighter and dont require as much HP to run strong.