bluewire what sort of rebuild are you doing on the 18R-GEU?
i know from standard it has a compression ratio of 8.3:1 which is a good starting point.
i have also just given my motor a complete rebuid. which consists of
chrome moly rings in honed bores on the standard pistons. new small end bushes and resized. new big end bearings and resized new main bearings. new/second hand crack tested, reground crank with flared oil holes. New mellings cast iron oil pump new timing chain and gears new graphite headgasket new valve seals intakes ported on the head valve grind valves tipped to max clearance to avoid the cam silencing ramp erm thats all i can remember at the moment but more should come to me.
how much did you pay for the supercharger? and what side of the motor are you mounting it?
i was thinking above the exhaust headers would be the best spot but could it get a bit hot?
if you are after new rings to fit the standard pistons ones from a 3vzFE camry motor suit i used ACL moly rings with an oversize of 1 mm to fit the standard bores. any more questions about the rebuild give me a yell.
a word of advice go for a brand new oil pump you cant skimp on these sort of things