(1) you can redrill a LA intake & use slanted spacers (3) An air gap would run a bit cooler but the main problem is the high volatility of todays gasoline (4) I dont know (5) I dont know (6) my magnums(uncut) are 63 & if you know your actual deck height you can go here a very user friendly user site & plug it in to get your actual CR http://kb-silvolite.com/calc.php? If you can achieve .035-.040 quench (piston to head) that will contribute more to you being able to use a lower grade of gas with out pinging than just the actual CR itself. (7) Same. The "jig" has been retired & sold