Yea,,,84mm is enough to keep cool with a decent compression, a 1429 stroker would let you have the cooling capibility of a stock block with the displacment of o large big bore, Use a 12.8cr JE piston with a 2.5mm spacer under the cylinder, APE welded stroker, Have a good shop put it together for you (if your in the ohio area Motorhead performance is a good one) megacycle 410/385 cams should work good with this combo, and will also work well down the road if you deciede to 84mm on the bore (1507cc) good luck with your project