actually, it is 10:1 in the first gen 1uz, and up to 10.5 in the newer ones.
also, the q45 tb is quite larger. it is a 80mm tb instead of 70mm. also, greddy sells an adaptor to let stock toyota tps's work on the q45 tb as the greddy intake plenum for the 2jzgte is flanged for the q45 tb.. but why bother?

if you want to stay n/a, pull the heads, port and polish, get a set of cams, custom headers, dual exhaust, itb's, and a megasquirt setup, as for pistons, ross will make pistons in any compression ratio you want, as will wiseco and je etc.. though for cheap, you can use the 10.5:1 pistons from a vvti 1uz. as well as these heads flow over sbc and sbf, id say you could pull ~400hp with the right combination all motor on 93 octane. but gas mileage will uttterly suck.

if you want to go turbo, get a set of arp head studs (not cheap). get a 1st gen 1uz (89-94, has the stronger rods and hyperutectic pistons at 10:1 compression). then use 3uz-fe headgaskets. they are mls(just like hks etc.. for 7mgte) stock, so just use 2 on each side(just like the 2jz na-t guys do with no issues over 800rwhp) and it will lower the compression ~1 full point (dont feel like punching everything into the compression calculator at the moment to find the exact compression). perfect for turbo on this engine. then the plumbing of the turbo etc.. is up to you. youll prolly have to ditch the a/c and power steering pumps, and then mount the alt on the driver side backwards to make sure you have plenty of room for the dp on the passenger side etc... though a built auto, r154, v160, or t56 will be needed to hold up. w58 will not last at all. they sell adaptors to fit a jz bh to the 1uz which will work for the v160 and r154, or you can buy the adaptor to fit the auto bh to an r154, and there is also an adaptor to fit the auto bh to a lt1 t56. v-eight.com is your friend!