[Alan Roehrich]

If it is legal, and they are dimensionally the same, (I think they are dimensionally the same and it's legal, but I haven't looked close at small block Oldsmobiles in Stock) I'd say sleeving a 350 down to make it a 307 would work well. I like the Melling flanged sleeves, yes, they're more expensive, and more expensive to put in, but they do not move. They're made out of the same material as severe duty diesel sleeves. I'd piour it up to the water pump holes, put the sleeves in, and then do the rest of the work. If you're running a hydraulic roller and 0.921" lifters, don't forget you'll have to have the lifter bores done.

I'd never put solid mounts on an Oldsmobile, ever. Rubber or urethane and a torque limiter is way better, the Oldsmobile blocks just aren't rugged enough. I don't really like solid mounts anyway, but especially never on an Oldsmobile.