71 340 Compression Test

bone stock 340 out of my 67
Those are not bad numbers. Unless I see smoke of any kind, hear knocking or noises of any kind; I'd run it like it is. Recheck those pressures warm and dry, then wet. Check oil pressures cold and hot, check the cooling system. If it all looks good, why spend the bucks? They don't come broke from the factory, it apparently had "some" care in it's life; go for it. You might get thousands of miles of use and no major worries. Spend the money when you need to; all else is investment with little return.