New to the 240sx

[MustangRacer]

Ok...so I bought a 1990 240sx last week. It has some front end damage so I'm looking for a front end...fenders, bumper, hood...how much do they go for...also where would i get a new front frame and new frame rails under the floor pans? I was trying to get the engine running smoothly... and it seems like the car has the wrong airbox...so I was messing with it and the maf. Which direction is the maf suppossed to be facing? I have the wiring facing up and the car seems to run smooth.

Have people been getting much gains from porting and polishing the heads and port matching the intake? just wondering if its worth my time...

Thanks in advance for any advice you guys can offer.

**I know i posted this on 2 topics but i thought this was a better place to post after the original post