Anyone know where I can find a '62 Chevy II pitman arm?

[Robdewaus]

I got a 1962 Chevy II Nova that I am converting from the original factory 6 cylinder to a 4.3 liter. I know, I know....what are you thinking? I have never seen anyone do this conversion and I am all about doing things that might seem difficult or different! So far, I have made new motor mounts and custom oil pan to go around steering rack that I had to replace because power assist was in the way. Now that I have gotten this far...almost there...I can't find a new pitman arm to fit. Looked everywhere and can only find 1963's and newer. Been told that 1963 will not work!!! I don't want to invest money in one that won't work, so does anyone have experience using a new model one or know a place where I can find one to fit?

Thanks for any insight you can give!