Doesnt Run right

I have a 97 Eclipse 420a converted to a 2.4 i recently found out that the guy that installed the engine for me didnt time it right, turns out i had to flip the cams around to make them 2.4 instead of 2.0 not a big deal.
but my rear main seal keeps leaking. ive replaced it once already and the car has only been driven about 1 mile. im sure once i actually get around to flipping the cams everything should run better. but the damn rear main seal is pissing me off.
not to mention i have to get a new transmission mount. do you think that is what could be ruining the rear main seal ?
let me tell you what i have done to it and maybe there is something im missing.
Overbore .20, Obx Intake manifold, Obx headers, Performance Cam gears, Lightweight underdrive pully, Short ram intake, polished crank, new engine bearings,
whats the deal ?

to much crank case pressure but the main problem with rear mains crank walk thurst bearing no good or not in right.

Your a ****ing moron, the 420a doesnt crankwalk