The 270 GMC is also an excellent engine that is more common than a 302 and should cost a lot less than a 302. The 270 was available over a longer period of time. The military 302 often has to be modified for use on a "regular" truck, but the 270 is usually just a bolt-in replacement for the 228/248.
The 302 is the best, but the 270 should not be ignored.
