Turbo 1g-fe could do that, I'd put the 1g-gte internals in though. Quite a lot of people just replace it for the 1G-GTE (old twin turbo supra engine) and be done with it. I reckon the cheapest option would be a turbo 1g-fe. As far as I can work out, it seems to be a mixed bag as to when people uprate the internals though. Some people run over 300 fine and others turn to mush at 280 or so. I've been looking in to this quite heavily lately. Got the 1G-GTE crank, rods and pistons sat in my garage waiting to go in. I reckon if you shopped around and did most of the work yourself you could probably just about manage on £5-6k. You are best off asking someone who has done it as I'm basing this on a few solid months of digging about on the net. You have to start thinking about other things once you up the power though; brakes, handling, clutch etc. so it will get very expensive very quickly. I'm basically trying to save £10k, though that brings it squarely in to 1JZ territory.