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Title says it all , i'd love to be able to build a rever flow Ford 300 I6 replica or a Ford 1500 Pre Crossflow engine

I wouldn't bet on it. Reversed flow doesn't make much sense. But it is cheap, older, and wouldn't need a lot of engineering in code to put into game (I think, should be mostly graphical) although I don't know about the simulations behind that coding. So maybe. Killrob?

When fighting with very small engine bays and inline engines, it would actually make sense. And a reverse-flow head could potentially be a bit cheaper to make. Of course it would take a lot of modelling, which is a problem. Coding-wise I doubt it would be that much work.

What is a reverse flow head? Any comparison between this and a normal head?

A reverse-flow engine has both the inlet and exhaust ports and manifolds located on the same side of the head like this:

http://ep.yimg.com/ay/yhst-191836747189 ... -cis-3.jpg

(Pictured is a '80s VW Golf GTI engine - 4 cyl 8 valve 1780cc.)

Ok. Like the 240z fairlady or 300sl gullwing engine!

Exactly. A reverse-flow head is more space-efficient, easier to manufacture and can be easier to service as long as the manifolds don't have to come off.

The minus is there is less freedom for shaping the inlet/exhaust channels and the valves practically have to be mounted in a single line. Maximum flow capacity is therefore less than on a cross-flow head.