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I have found and used three programs convert.f90 (Michael Metcalf), preconvert.f90 (Purple Sage Computing Solutions, Inc.) and to_f90.f90 (Alan Miller).
None of them worked 100% like I expected. Results depends on how closely your source matches what the programs expect to see.
For your convenience I have zipped the source files up and hosted them here: Source Files
I have used Compaq Visual Fortran 6.5 to compile into three separate projects. If you want the projects also use this link CVF 6.5 Projects
Best of luck.