plenum size

Not sure I'd consider myself any type of pro here, but thanks for the inclusion.
In thinking about it - the 505 will eat any plenum you can give it and love it. So I'd think the smaller plenum, and better atomization of the EFI will work well, probably as well as a larger plenum and carb combo... Depending on the carb and what you liked about that particular iteration. Power-wise, given they're both single 4bbl open plenums, and IMPO "small" for the stroke, it won't be a night-and-day difference. But all that's just me thinking out loud (through the keyboard).