hey i also just found out i have the same motor and i did find if you check the code by the alternator and the last three letters are cmj its a ca. only motor it had very low compression like 8:2 or 8:5 i think the type of 350 is lm-1 they did use this motor in 1974 and 1975 for police cars and produced 160 rwhp and a trap speed of 85mph which breaks down to about 15.9-16.1 in a 1/4 the head cc's are 76 im switching to 67cc to jump compression a touch hope that helps figure some stuff out