I have an early car as well - an '84 - so it 'should' work the same.
The chips are either made for Standard/Sports or Headers/SSIs. Site ref is here: http://www.swchips.com/c1chips.html
Your's - IMHO - falls into standard/sports as you're using standard heat exchangers which is what this chip has been coded for.
The number of pins does change on the 3.2 but I think that's around the year the switch is from 915 to G50. Someone on here with better knowledge that I will know for sure.
Hope this helps.