Stock Refurbished Rods VS Scat I Beam

I would not run anything less than Eagle H beams in it. Neither stock nor SIR type rods will take the power that can make for long. What I would change: Port the heads. At least a stage 2 job so you're getting around 260-265cfm. Go a lot larger on the cam. Closer to 270 @ .050" with .600 lift. The intake would be better as a single plane like the M1 with a 1" open spacer, or preferrably the Victor 340. Run a carb of at least 950cfm dry flowed.