Good points. For many earlier year cars the feed line is on the passenger side & runs next to the headers along the frame as well as crosses over at the front of the oil pan literally clamped to the pan/timing cover bolts, so if heat is a concern that location could be an issue. I do use heat wrap on the lines in those areas just to be safe.
Road heat isnt really a concern in midwestern or northern states, Iowa gets some very hot/humid days in the mid to upper 90's, even hits 100-103 some years, but I dont usually drive when its that hot with no A/C and when I do Ive never had a vapor lock issue with a deadhead mech pump... electric pump has much higher psi thats supposed to eliminate or reduce vapor lock.
I guess it comes down to where you want to mount the regulator or investing in a full return set up, sounds like it can work both ways with a full or short return line.
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