360 build
A bit more h.p,maybe 20 or so. Should put you right around 340 h.p. It's an extreme energy design,so it's a bit more modern than the 212 grind. Faster ramps means the valve opens quicker.
Go with it. Did your engine builder reccomend it? If so he's on your side cuz it's a good upgrade!
Have some bowl work done on the 360 heads if you can afford it.Nothing crazy,just a good valve job and blending.