thanks & I'd like to change gears if I get the 518 trans installed. 3.91's or 4:10's would be great with an OD & a friend who does 518 conversions has one waiting. 1st cam I had in it 10 yrs ago was way to big & when we changed it a few yrs ago, cam was too small. So I'll do what Dwyane advises & check what the compression will be.