ya bro...i had a e34 before this....its 24v 2.0...i upgraded abit...just meet wif accident in jalan kuching...car total lost but the engine still perfect...so convert that engine will be easier for me....
mine is also for sale 1990 model 5-5 fully done up with ac ori body kit,17in ori ac 3pc rim and very powderful with fantastic paint job and new face lift
Original m20b20 already upgraded to m20b25. Wide grille conversion, crystal rear lights, bodykits, 17" ACS type IV replicas, etc. etc...
Bad news, I won't sell it for your budgeted price. However, if you're willing to pay more, the good news is, you don't need to fork out for the engine upgrade.
PM me if you are keen. Otherwise, good luck in your search!