If you have the LD340 I would use that. If you need a new intake I would go with a Performer RPM. The RPM and Air gap are the same runner and height only difference being the "airgap" under the runners. I doubt you will see any gain from that and I feel its not worth th extra $100 over the regular RPM


I ran a LD340 on a low compression 340 and it always ran hard. I also used on a 11:1 340 that was ported for a Thermoquad. Great intakes.

Dont under estimate the stock spreadbore 340 intake though. If you all ready have one they perform great as well.