bluemaumau wrote:buy a blacktop and put silvertop rods in it, will be less than 4k id say, would be a mean track car
Agreed
OR Build yourself a 7age. 7afe block/crank and conrods, silvertop pistons, redtop head, silvertop ITB's. You can get all these parts cheaply from trademe ($60 for pistons, 7afe engine for $300 or so, $200 for ITB's) then get yourself a megasquirt from america or run a redtop ecu and dizzy.
Can do it cheaply/do it yourself and you will have a 1800cc that goes like hell that will bolt unmodified into your ae82.
edit:
didnt really answer your questions haha.
Bluetop has 88kw standard and redtop has 100kw. Redtop has slightly higher compression and smaller intake ports. If you lok around on here you will find heaps of information regarding the differences in these engines.
2 1/4" exhaust is a good upgrade, if your going to keep it 16v use the blacktop extractors. The usual like pod filter/cold air box will give you some more power, and just rebuilding the engine with new bearings and stuff will really improve the responsiveness of the engine.
But if you have $4k to spare, id buy a new engine. Rebuild it then slot it in there.