i checked and have an oversized radiator with bigger hoses,moving a lot more coolant than stock wich should cool everything alot better. and this thing will be babied it will be a sand princess. i mainly do jumps and sand trails. actually im pretty sure arlan told me to powder coat the cases. so i think im just going to powdercoat. plus its pretty easy for me to powder coat the cylinder because i do it all in my shop.
One of the hardest things growing up is knowing when you're getting good advice. I ruined my first set of cases after powder coating. Not too many hours later, two of my transmission bearings were loose in the bore. it's anecdotal, but I have no other known reason that's as likely to account for the widening bore holes. The cases are now my mock set for scribing port timing... Jerry Hall consumes and creates scientific data and has a deep physics background. You should take his advice. It's just not worth the risk. Rustoleum satin black is a really close match to OE black. Duplicolor Storm Gray for 86-7.
The size of your hoses probably don't matter so is not a reason to thik you can afford added heat retention. The tightest restriction in the coolant system is going to be the rate of flow, at best. You can attach your water pump to a drinking straw, then into a sewer pipe back to your water pump, It's only going to flow as much as the drinking straw allows, not the sewer pipe. I grew up in Glamis. Sand is one of the highest drag, engine heating surfaces you can ride on.
If you're a hands on guy and have a bead blaster, do the cylinder and head with glass beads. It will shine up the aluminum without reducing emissivity too badly. Take good advice. People don't like to keep seing it wasted. They stop giving it for free or reserve it for a different population.