Just wondering if anyone can help me out in my search for a fairly mild crate motor. Don't have much time to work on an entire buildup, work7 days a week and go to college as well (not much $ also) and I was wondering if anyone can recommend a crate motor producing an amount of power that the stock tranny/rearend can also handle. I only put 3-5k miles on the 5.0 per year, and maybe it will see the track twice a year. The current motor needs a replaced front and rear main seal, along with whatever else (im not sure if anything else is wrong with the motor, but i figure i will be much happier with a crate professionally built than having a friend and I teach ourselves how to change the seals. Anyways, I also can purchase a 75shot of Nx express of a friend that was setup to be used for a '95 m3. MY question is...since it is an 87 my 5.0 has Speed Density...would i need to upgrade to mass air meter for a gt40x FRPP motor?? OR would literally i just be able to toss that crate motor in and just upgrade the Intake. Will i be better off just using the 75shot and upgrading the h/c/i? Motor has 88k on it...