oh yea, i forgot to mention that, SOME 340s, but not all, had 2.02 intake valves compared to the 1.88s. They were basically the same heads between the 340 and 360 just those few years of 340's had the bigger valves. You can get the 360 heads machined for 2.02 intake valves relatively cheap. It cost me $250.00 extra to get the 2.02's in my 360 heads I used on my 360.