LT4 Hotcam this what I using in my 383.
I have heard there som other cams that will pass smog but this cheeper way to go than other cams I looked.
383 4 bolt main (10.5 to 1) Balanced, Flat top , pistons LT-4 Hotcam, C C ultra pro magnum steel 1.6 RRA, Trick Flow Heads Super 23 (195 runners) 62cc , SPL runners, Hi Flow intake base, 24# FIC Bosch 3 Injectors, Chipped, Melrose full headers, 3 way Main cat, Borla 11134.
700r4 Trans built, 2500 Stall Lock up Convertor, 307 rearend.
403 H/P @ 5000
498 TQ @ 3000