LS1 air intake for a 67-72

[chevy72blu]

I have gone through lots of build threads, but I cant seem to find what I'm looking for.

What air intake setups are you using in your 67-72? I've seen some real cheap ones on ebay for around $60-70, but its difficult to envision what is going to fit and what wont from pictures.

I think just a simple 90* coming out of the TB with a 6-7" pipe and cone filter would work best. Street and Performance also makes a square element that bolts right to the TB. Any downside to this?

Also, what size tubing are you using? I am using the OEM 98' LS1 TB and MAF

Thanks!

edit: I am using a '98 F body rad and e-fan setup