My car - 1972 Skylark convertible with stock 3/8" fuel supply line and 1/4" return lines. I'm finally ready to R&R my Buick 350 and TH200-4R with a BBB/TH200-4R combo. I plan on replacing my OEM fuel lines while the engine and drive line are out of the way. I planning on using the 2-piece "original" or stainless steel reproduction hard-lines listed by OPG. What difficulties can I expect to run into while installing them on my convertible? As always, thanks in advance for your input.