[vettestr]

69 Mach,
What ever it is the big issue is has it been set up with all working relationships. does it work or are you breaking stuff? A difference of .450 does seem to be way out there and noy likely.
Not being a wise a$$ here but anything is possible. You would not believe what has been brought to my machine shop over the years.
It would seem the P rod would be about 3/8 " too long and that does not seeem feasable but a .250 long P rod and a .200 SHORT valve stem etc.... it might run?