I am going to be going to the GM hot cam in my car with at least 1.6 rockers, maybe even 1.7 since that is what GM tested it with. But anyways, I wanna know what spring I need to get to run .525 lift out of a stock centerbolt 350 head?? also, would you guys recomend that come spring I replace those heads with after market, or shoculd I try and find a nice core stock head have it ported to hell and throw the 2.02 vlaves in them?? that is what was recomended to me, and I can get the ehads and the machine work cheap, so does that sound better than a G on aftermarket heads? oh, I am running a 383 now too, not the stock 350. My main concern is that from a bigger motor I am going to out-flow my heads once I open up my intake which will most likely be done with the LT1 intake. any help would be great, thanks guys.