My understanding is that the 35 and 38 are the same block; difference is that the 38 runs at higher RPM (I think the only difference is how the governor is set). Given what you're looking for, probably you'd prefer the 38. Similar to Brian, I also got the remote oil filter, which makes changing much easier/neater. Opted for 120 amp single alternator, which has serpentine-style belt which is a big improvement over V belt. Cheers, John