LA Engines???

Well to get the compression up you can use the Mag heads as kraby suggested. There are lots of choice for pistons too. A combination of the two will probably yield the best results. Aim for 9.5:1 maybe 10:1 compression. Top it off with a eddy air gap intake and a cam to take advantage of the better flow and you should have a fairly stout 360. The comp cams xe268 would be a good place to start. Probably get away with more cam but it would make it a real stump puller.

There are many guys on here more knowledgable than myself that can come up with a better combo but that gives you an idea anyways.