I guess my history is messed up then.
I thought the 89-91 were still LA's and in 82 the chev rocker arm mag's were born. With no fuel pump eccentric on the cam and no oil feed passage thru the block for the rocker arms.
92 or 93 was the first year for the magnum engine and the Early blocks were drilled for LA heads. I would have to look it up to find out when the blocks were not drilled anymore
