I have a vacuum secondary carb, its ok but a mechanical secondary isnt really eny less driveable. I actually and getting rid of my 750 holley vac secondary in favor of a Demon 750 mechanical. My secondaries dont open as fast as i think they should no matter which spring i run so i am going with a mechanical setup. My engine is somewhere around 500-550hp.
A 650-750 will be fine for you. Running a vacuum secondary carb in your situation wouldnt be a bad idea though since you have a heavier truck. My 2900lb car wont open the secondaries when i want them to no matter the springs i try.
I've heard nothing but good things about prosystems but they can be pricey. I guess if you dont own a carb already a few hundred extra wont really matter.
Also buy the MSD 6010 box as mentioned, not the edelbrock box so you can tune it. I think the RPM manifold is a good choice for your setup.
__________________ 1994 Z28 - 13.52@110mph 2.1 60ft T56, bolt-ons, suspension
1978 Datsun 2+2 - 6.0L LS1 swap in progress
1968 Firebird, 2820 dry- 2000 LS1, D&D Viper T56, RAM clutch/flywheel, 236/236 .651/.651 110+4LSA cam, victor JR EFI, 4150 TB, 42lbers, painless harness, Moroso 7qt pan, sfc, trac bars, 3" x pipe side exits, Telstars-30"MT streets/skinnies, mini-tub, 8.5" posi, richmond 4.56s, Hooker lLTs, Denny N20 DS, Fast dual wideband, Shotgun street scoop. http://www.myspace.com/shawnmacananny |