This will be a very strong engine, cam lift may sound a little excessive, but the short duration will offset that and be streetable without any issues. Good on the head work, removing those sharp edges in the combustion chamber and port matching (along with the intake manfold), is all great. At this point, because you are sticking with the EFI setup, which is a good thing these days, port injection does not need a dual plane design, M1 works, but the air gap would keep the air a little cooler, as long as it is a single plane intake, so I have to match your thought, it is a hard decision, once the heads are ported both will work just fine for bottom end torque on the street and towing, the injection on the port opening fixes this, and on a carbureted engine, works on the street. At this point I would then say, since they will both work properly and give you bottom end power you will need (the edging in the chamber does a majority of this for your towing needs), go with the cool looks factor, it is a six, one half dozen decision for functionality. Again, as with the heads, match the manifold ports, they are always off on one side, leave the carbide burr cutting surface, keeps everything cleaner and promotes fuel atomization in the ports, less carbon and fuel coking inside, which is a plus, the chamber edgine stops the pinging and allows your compression without batting an eye, and you can run the cheapest gas you can find, I was able to run 13.3:1 compression on 75 octane without a problem.
