On my 383 I'm using a Dart Cool can (RPM air gap) my combo I'm using 5.7 rods flat top pisons. 10.1cr Dart Pro 1 heads 200, 72cc chambers 2.05 in 160 ex. Comp cams hyd roller cam 8-422-8 w/1.65 in (544lift) and 1.55 ex (519lift). I'm using a 750 HP searies holley Dp with a 1" 4 hole phenolic spacer here are some pics http://community.webshots.com/photo/...27752191jajmZr