Take the longtubes if you think they present value to you for the money. I find them all the time for various prices. 270 isn't bad if they're in good shape.
Since you do track days, check out a head/cam/intake package. Edelbrock makes GREAT kits that are proven to produce good power at a reasonable price. 5.0's are so easy to make power with that it's more a matter of deciding how much power you want to pay the fuel bill for. ... 300, 400, 500hp? BTW... don't plan on over 500hp unless you plan on buying an aftermarket block. Yours will become increasingly likely to give up the ghost shortly after 500rwhp.
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