can any of you kind fellos tell me how to and how much of a job it is to put 350 heads on a 305?

 

not a big job at all there are basicly the same head with diffrent specs the 305 heads will have a 58 cc chamber with 1.85/1.50 valves with a 178 cc runners for the l69 heads and 58cc chamber with 1.76/1.46 valves with 158 cc runner for the lg4 heads
and as for the 350 heads they have 76 cc chamber 1.85/1.50 with178 cc runners depending what years heads you get!some came with 2.02/1.60 so if you are not going to rebuild your motor i would not changer your heads the compression would be to low