Best guess this combo. Early 360 block with Scat 4" stroker kit at 10.5 to 1 compression . Comp Cams hydraulic flat tappet XE-295HL , 251-257 @.050" W/Harland Sharp 1.5 rockers. SDSS stage 2 Edelbrocks , flow 285 @ .500" Ported air gap , holley 950 HP and TTI 1-5/8"-1-3?4 step headers.