URQ engine options

[Steve R]

What would be some good choices today if one was re powering an 82 URQ. 

My car in question is an unfinished project started in 1990. I picked up an almost new 89 mc2 motor with harness and cpu from a wreck.Being who I was then I eventually ended up redoing the entire motor. Throught the years my intension was to replace the cis with an aftermarket system. This engin with all the upgrades it will have shoul easily put out 300hp.

The car is in fantastic shape and needs to be on the road.

I don't think a 20v is worth the effort at this time so what if any are my options. V8?   Opinions?

TIA

Steve