... a couple of spacers, and a SBC intake manifold help ...

Are these spacers available or do they need to be fabricated?

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What vehicle?  Are you wanting to keep it original looking?  If not, then a couple of spacers, and a SBC intake manifold help, and headers, pertronix ignition, and a good 750 cfm carb.  I have ported several sets of the heads, and they respond well to that if you decide to wake the engine up.  Simply adding a roller camshaft will not get you there.  The cam cores are really difficult to find.  Royce B. is the resident expert on the 368 Y.  Joe-JDC 

JDC

I'm looking for professional input. I have a very nice 368 block. Not looking to build a race engine but wondering what i can do to pump it up a little. Can I run roller lifters/cam?