Why not just scrounge up an 87 or later block[one piece rear seal] and build it using one of Skip Whites stroker kits,then add your heads and a zz4 cam in it? CC those heads.If I remember right,the had an odd ball chamber size of around 65-66 cc.s.I do know that's when the 2.00 intake,1.55 exhaust valves showed up.They were reportedly good heads,and the valve springs will work with either the zz4 or the Hot cams.I agree the the Hot cam is a little much for a truck that get used for towing.