RRR,
I think the boosters are the same, but the performance version has richer jetting.
Steve,
The 1405/6 are 625 cfm. If the 383 is just a mild perf engine, then it will work fine & a good choice. The factory fitted AVS was 625 cfm, & it was also used on std 440s.
Who built the engine? FT cam? Broken in correctly? What brand lifters? Cam specs?
