1970 heads part #

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

I'm in the process of tearing down a 1970 360. I noticed that the
drivers side head has the part number 3196291-C and the passenger
side head has the number 3196291-1 or I.  Is there a reason they both
aren't the 3196291-C ?  The intake valves measure 2.025 and the exhausts
measure 1.625. Because the exhaust are the 1.625 diameter these heads must
be from the early 70 model year. What besides exhaust valve diameter is
different on these heads and the late 70 heads with 1.6280 diameter exhaust
valves. Can I get the 1.680 exhaust valves and install them? Would  the
valve
seat need to be enlarged also?
Oh, the engine is from an Ambassador. It was very rusty and too far gone to
save.

thanks
Armand