406sbc internally balanced, zero decked,blue printed. 6in rods wisco protru 21cc dished pistons. HR 227-231 535-550 110LSA installad on a 10 ICL, Crane 7/16 1.5 RR.10to1 motor Afr eliminators(1034 street heads). Eddy rpm air gap(port matched) Hedmen mid length 1 5/8 primary tube headers. F.A.S.T EZ efi, Msd pro billet dizzy(16*base 36* total all in by 2600) Machine shop that port mached the intake said 470HP AT 5600 AND 490LB AT 3900. Does this sound about wright.