Thanks for all the suggestions!
To answer your question Bill the tank measures
28"x29"x10".
The way I want to situate it, the 28" will go between the frame rails. It is the 29" length that is giving me trouble. There is a small round crossbar that will have to go - that gices me no heartburn at all. After that, the last crossmember on the frame is in the way.
What I am considering is either removing the crossmember completly and fabbing a new one from heavy wall square tubing, or relocating the stock crossmember further back.
I occasionaly pull trailers - anything from a single axle 5x10 utility trailer to a 2 horse
side by side - so strength is potentially an issue.
Thanks Again for all your input! I look forward to further suggestions.

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'67 Chevy C-10 283/350