My 327 desktop dyno'd at 320 HP and 349 TQ with a Lunati 216/228 @ 0.050 cam, performer vortec intake, Holley 650 VS, headers, duals and vortec heads. I'd like to get to 350-375 horses and similar tq values if not 400 hp and TQ. Will a conversion to a roller cam get me there?

Chevy high performance did a build up with a slightly larger cam and ported 2.02/1.60 camel hump heads and made something like 410 hp and 400 tq.

What do i need to get there without starting over from scratch?

Clyde