Let's proceed directly to Gary's very detailed and insightful comments: I run them on a 413-cube small block and have nothing but positive comments for them. BTW - if you use Vortec heads you'll be flat amazed at how much power these things make for a truck head. Here is one of his posts that directly answer’s some of your queries. I have several of his posts saved from a techboard somewhere on the net - I think it might be chevytalk, or chevelletalk or something like that. 'Here's some gold for you from Gary Penn of GM Performance Parts. I just honestly don't know what to look for. I know people ask these questions all the time and probably don't listen to the advice given. Would hate to get something that wouldn't work. I've tried to figure out cam selection on my own, but I'm having a hard time deciphering what each number means in real world terms. Right now it has 2.41 or something (ouch). I have a 4.56 posi that I will probably put in there, but may go with a 3.73 if i can find one. I'm looking for something the has a very noticible lumpy idle as it will just be a weekend cruiser, street mainly - no highway. Probably looking to buy an Edelbrock Vortec RPM too. My question is what what cam should I limit myself to with these? I'm not sure what cylinder volume is (or if it matter) but from the looks of it, it appears the block has not been decked, the cylinders are bored 040 over, and the pistons are slightly dished with valve reliefs. I don't have the cash, nor the need, to upgrade the springs or anything on them. I've got some 906 casting vortec heads coming in tomorrow or thursday with about 20k on them.

Ramjet 350 cam in l31