the old 347s had oil ring design. But they are much better now, But id go with a 331 myself. You can always do a motor yourself, just need a good donor shortblock with crank and rods. I got my block and crank for like $50, bought a set of recon rods with arp bolts fro $120. $300 in machine work on the block and crank, polishing, honing and just checking, no boring at all. $500 for an engine kit which came with pistsons, rings, gaskets, bearings, oil pump, timing chain. Assmeble yourself. Mines got 30k miles on it and it was just slapped together. Though its bound to blow up soon