1UZ-FE check out lextreme if you haven't already, there may be less fab work than you'd think.
from peewee wrote:6MGE
bolts up, wires up, no effort required
worthy if you can get one cheap.
Difficulty 1/10
Worth it? extra 20hp, 20 Nm torque, once again, price dependent (This is over the 5MGE, not the 5ME)
7MGE
bolts up, needs 7MGE loom, ecu and be 'spliced' into MX73
may be able to use 5MGE harness and sensors, but wouldn’t get full effect.
may need small exhaust change to suit MX73 system
Difficulty 3/10
Worth it? extra 30hp, 30 Nm torque, price dependent (over the 5MGE)
7MGTE
bolts up, NEEDS 7MGTE loom, ecu, and be spliced into MX73
needs bigger exhaust and intercooler to get best benefit.
Difficulty 4/10
Worth it? yes, if you can get one for a good price
1GGTE
Bolts up with GX71/GA61 1G-EU or 1G-GEU mounts.
needs 1G gbox (or at least the bellhousing)
needs 1GGTE loom and ecu, and be spliced.
needs bigger exhaust and intercooler to get best benefit.
Difficulty 5/10
Worth it? yes, if you can get one for a good price, and you have the mounting sorted.
1JZGTE
Can use custom mounts with the stock crossmember (available in Australia, was $250AUD plus postage, not sure now) or you can use an MX83 crossmember, and factory JZX81 mounts,(late 90-92 for Australia, any MX83 for US), or you can use the factory JZX81 crossmember and mounts (ie, if you get a JZX81 front cut)
needs 1JZ gbox (or at least the bellhousing)
needs 1JZGTE loom and ecu, and be spliced.
needs bigger exhaust and intercooler to get best benefit.
Difficulty 7/10
Worth it? yes.
The Nonturbo 1JZ-GE isn't really a worthy swap for the dollars it costs, unless you can get one uber cheap.
2JZGTE
as above for 1JZGTE (same mounting), but will have clearance issues with turbo's (may not apply to LHD)
Difficulty 9/10
Worth it? yes.
The nonturbo 2JZ-GE is also definately worth a look. It will match a stock 7M-GTE any day of the week, and is capable of nice figures with some dollars thrown at it.
1UZFE
needs custom mounts (available from me, $120AUD plus postage)
needs custom exhaust, and most likely manifold modifications around steering
needs 1UZFE loom and ecu, and be spliced
Difficulty 8/10
Worth it? yes.
ALL motors will need a front sump version.
ALL sumps can be interchanged within the same family (ie, if you buy a 1jz with a mid sump, you can put a 2jz front sump on it, but you need the sump (both halves), baffle plate, pickup, and dipstick/tube)
All loom problems can be sorted with going aftermarket ECU
Any motor with coilpacks (ie, not a standard coil) will need a tacho converter
Cost of installation of all motors is the same.
What varies is exhaust costs, intercooler costs, wiring costs.
Turbo motors may require a radiator upgrade.