Engine recommendation - - - reality has screwed up my plans

Thanks everyone!
I'm still in a tossup about what to get, but i have a lot of ideas now. I really appreciate all your ideas.
-Rick91GT, the first thing i'm doing is stiffening my chassis (just ordered some full length subframe connectors, and strut tower brace). I'm also going to get a rear shock tower brace fabricated and weld in a 6 point (at least) roll bar. I also want to go through and reinforce and weld the torque boxes and upper control arms mounts. After that i'll get a drag race springs/shocks, control arms and some sort of traction device like southside traction bars or lift bars or something....anyways.....
Thanks again, i really appreciate everyone's help.

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'84 Mustang 5.0 LX
My car