Another 318 build, and questions. (LONG)

gracias! i read up on both of those builds, makes me feel better about what i planned on. however now im wanting to lean towards the existing flat tops and milling my open chamber later 360 4323345 casting heads .040 to .050 (8 to 10cc's, 69 to 64 roughly) to keep compression up, granted the slugs arent el-cheapos, if theyre no-name units then im going to get KB167's. ive read up on domed units, they get hotter because theres more material to withold heat, makes sense, and can be no bueno, i figure if i can shy away from it, its one less thing to worry about.

On the flip side, my lovely open chamber heads arent worth a hoot to deliver any sort of quench, wich makes zero-decking essentially useless, and im not planning on going through numerous sets of "302" or magnum heads trying to find a set that isnt cracked, been there sunk that boat, and im not forking out 1200 bucks for new RHS units, im too damn cheap, scottish, and "poe"....so now im back to the domed KB399's and minimal machining of my current heads to keep compression up....but with no quench-face in the head....it will be much more prone to detonation issues right? How in the world did ma-mopar keep detonation to a minimum with zero-quench heads without dumping the pistons a mile in the hole?! ugh....this shtuff is confuzzling and is driving me nuts....HELP!!!...please!!

Im going to stick with the XE268 cam, seems to be a real snotty runner, exactly what im after. I always run 91 in my rigs, so 9.5ish (9.1 minimum) should be fine right? if not i have some close friends who work at the local airport....i have access to 112 low-lead for 4.19 a gallon.....dual fuel system? yes yes?