does the year matter for the 20r head? i have heard something about valve sizes?
any year 20R can be used, to my knowledge all 20R's had the same size valves, however all 20R heads didnt have the mounting for the pwr steering pump
i ran a 79 20R head, intake, timing cover, oil pump, on a 82 model 22R block for a few years, it was VERY fun to drive
btw run the aluminum rocker arms,
