Here's some input for your pick up issue…
I put a 20 gallon tank from a 71-73 Mustang in my 51 Panel; mounted between the frame rails where the spare tire carrier used t one. I did this at the recommendation of the older gentleman at jim Carter some years ago when he was a tech advisor. The side saddle tank gets in the way of exhaust, trans cooler/lines
etc… so it had to go
He was right..it fit perfectly and looks factory. Tucked way up there and not hanging down. You DO have to relocate the filler opening from the center rear to wherever in the bed you want it to exit. I put a covered recessed "well" in the rear right of the cargo area just inboard of the frame rail & used an AutoMeter sending unit. You can use the stock Mustang hanger straps, but you'll have to lengthen them…. or, just make new ones. Really nice to have 20 gallons on board with a 455 Buick up front!
mike
