[ASH302]

The most I ever did on Mach was install a Procharger. I also installed JBA shorty headers, which I did it the hardest way possible when I did it.
I did on my 98 Cobra have to replace the oil pan gasket when it had a leak, because I didn't want to pay a shop the amount they wanted. I was able to buy a bunch of extra parts to throw on, but I got a taste of really diving in there.
Honestly, even with what I know now. I would rather just take it to a performance shop where they have all the tools and know how to get the job done.
By all means, if you want to learn, then jump in there and get it done. I don't know how much experience you have, but imo it is a big job.
Another thing you could consider, is asking a shop how much they would charge to do the whole job vs. you pulling the motor and taking it to them. This might help you choose which way to go in this adventure.

ASh