I just got a 70 javelin sst 390 from my uncle. My grandpa bought the car new in 1970 and put about 16000 miles on it before the he got bit by the racing bug. The trans and factory rear end were modified by Art Carr, and the engine was built by a speed shop in california. I was wondering if anyone here could tell me how to I.D. the cyl heads, from casting numbers and such?