BEAMS Redtop is FWD. BEAMS blacktop that came from an Altezza (roughly the same shape as a Lexus IS300 in the USA) are RWD but cost a fair bit. However a fair bit of horsepower from factory(210 for the manual version and 200 for the auto version) and the sky is the limit after that. You can get a 5SFE bottom end with a BEAMS head to make a 2.2L 4cylinder. Use Eagle rods and 3SGTE piston or modify 2JZ pistons and then turbo it too. I saw a RWD BEAMS in an Altezza put out 430rwkw!!!
Transmission, you can bash your tunnel to fit the 6 - speed or if you are chasing big power get a W box. Or step it up to a R154 I heard they are a dime in a dozen in the states because toyota put them in some Tacomas??? Is that right?
But I have also heard that the exhaust is a problem because of LHD. That is probably why someone suggest using a Honda S200 motor because the exhaust will come out on your passenger side. There are a few companies making a kit to make this conversion fairly simple.
I am a yankee living in Australia I ask my sister and parents to find some stuff for me in the states from time to time