they seem to be way to short duration,and poor lifts,,Ive tryed them and couldn't get any real power,and gas mileage sucked,remember your 50-100 cubes more then stock,,best combo was
1.454 2 or 4bolt block [2 bolt blocks work great on the street]
2.open chamber oval port heads,with real mild pocket porting [you could use edelbrock aluminum oval port heads too]
3.1/4'' over stroker crank[makes 20-30% more torque]
4.3/8'' bolt rods [just shot-peened and arp bolts] no need for big rods,your not going to twist it that hard
5.cam -hyd roller ,230-240 dur at .050,,lifts of .530-.550,,split durations are usually better down low [if money is tight just hyd] I'll get out a few cam cards and post them
6.comp 9.5-1 or as much as 10.5-1 if you use aluminum heads
7.780 cfm Holley carb
8.dual-plane aluminum intake
9.gm hei distributer
10.1 7/8'' tube headers and a real 2-1/4 to 2 1/2'' full exhaust with a cross-over [need to be ceramic coated]
i can give way more info if you need,,you can go with fuel injection but it gets costly as ive use merc marine e.f.i. units [factory gm is race only] with after-market wiring [factory merc stuff douesen't use o2 sensors] and custom computers [its worth 3-4 mpg's],
