<< '89 240SX ---> $1500USD in decent condition
SR20DET with tranny, IC, and other needed stuff --> $4000
Rest goes into misc stuff such as bigger turbos, plumbing, etc.. >>
And that will let you run around mid-high 13s in a gutted car... that's far too much $$ and work for a "stock car"
You can buy a 90-94 AWD Eclipse/Talon for about $2k and change leaving almost 4K for mods... that can buy you new turbo, FMIC, etc.etc.etc. and prolly run into the 11s. DSMs are incredibly dominant in import drag as well... (albeit, people break trannys a lot)
Sure, the light CRX & H22A combo is fast... but you'll have zippo left over, have a tendency to break and will be outrun by well-tuned Neons in all-motor... ask Scott Mohler. You might even squeeze enough $$ for a turbo'ed Neon under the budget.