Guy's, I Have A Original,44,000 mile B.B. 400 In Great Condition. I Have Replaced The Heads With A Pair Of 516's That Have Been Slightly Ported, Have 2.08/1.74 Valves,& measure to 72cc's. Pistons are .100 in the hole, & am using .020 steel shim gaskets. compression should be about 9to1 ?headers,750 Holley V.C. on performer Intake. was going to use a compcam 275DEH..462/.482 219/235@.050.110LS But I Was Givin A Summit Cam # 6401. .466/.488 224/234@.050 114LS.very close Lift/Duration, what will the wider LS do or not do ? engine will be in a '68 Dart with auto, stock convertor, 3.55 gears, street driven until 470 is built. 1 to 1.5 years.