What intake to look for??? Stock 360 crate motor

Dude, re-read these posts;
12, 13, 14, 17, 19

Dollars to donuts, the intake is NOT your problem.

• pick up a service manual $50 +/- or free on MyMopar - Mopar Forums & Information - Service Manuals
• check and replace plugs with proper temp range and gap (probably 0.035" if my old brain remembers right) $16
• replace wires $50-80
• check compression. Rent the tool at Autozone or O'reilley
• points distributor? I bet the contacts are all kinds of fucked. Replace with new points, set gap and dwell $10-$20, plus tool rental
• set timing. $20 timing light
• use new gas. New fuel filter $10
• check/change oil is it diarrhea tan? black? chunky? $10 filter, $10-$20 for oil. Just use the dino stuff, if you switch to synthetic, you'll probably get a rear mainseal leak, and leaks elsewhere too.
• pull valve covers. Are the rockers all moving the same? Are some valves stuck open? Are the pushrods straight?
• Check timing chain. $50 for a new one, rent harmonic damper puller

Edelbrock Performer or RPM Air Gap if you want to spend more money.