i have a 84 S10 with a 355 small block w/a 272 powermax crane cam 216-228 dur w454-480 lift was wondering also what rpm's should i shift at? if anyone else used this cam let me know it has 981 comp and has world prod sr ported and has 373's gears w350 turbo full manul vaule body 2800-3200 tci it pulls very hard and i like it can't wait to run 1/4 mile. yee haw