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with slight port on the head
If you can't get some one that knows what they are doing to port your head then leave it alone, it's so easy to make them flow worse by taking metal out & then it's a bin job. You actually need a 73+ head which you can have ported prefessionally latter.
K cam is good if you want to stay with the stock springs, D cam needs dual springs. If the iron manifold is the early version with butterflies, use that instead of the aluminium manifold because it is better. Just radius the balance pipe (It's HUGE compared to the aluminium version). If you are bored, open up the exhaust manifold at the head face towards gasket size & polish the outlet to 1.625". KD or KN needles & stock springs in the HS6 SU's. If you do any good work to the intake ports, you may need stiffer springs & different needles.
If the head is B20B thickness & straight, leave it as is & just use the thin B20E head gasket. I would pull it apart, polish the crank, possibly hone it & clean, clean, clean it. You should be able to get some moly top rings for it pretty cheap, get a set foo some Chev or similar that has 3.5" bores.
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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