Big Block Conversion $$$

You really don't need subframe connectors in a hardtop. We never had them on my old 67 GT. Your cost will be directly related to how much fabrication you are willing to do and what kind of deal you can find on parts. But, here's the basis of ANY a-body custom build that I would regardless of the engine choice.

1. Bigger brakes and discs
2. More wheel and tire
3. Bigger torsion bars plus a sway bar, good shocks

After that it's just the drivetrain. High performance requires more than a 7-1/4 rear end, so that's the same small block or big block.

So, now with a mild B-motor you can run iron exhaust manifolds and a stock rebuilt 727. A four speed adds considerable cost whether a small block or big block.

I'll have my Barracuda mechanically done for about $500 (that's after the engine and trans core - I have a good condition 440).