M1 SP vs Air Gap

Don't want to steal the thread,but since everyone is talking, just a quick question. I have an LD4B and would like to use it on a 340 with x heads. I'm going to run a thermoquad. Would I be better off to run an adapter or open up the intake so the TQ can bolt direct. I'm after low to mid range torque. Also, if I port match the intake to the heads, will it be the same as an LD340?
Thanks guys.

I think the LD4B is for the smaller port 318 heads. You can still use it but the LD340 would be better. Just my opinion.