Thanks Troy, my experience is very limited and in all reality I had intend to use the Offy lowrise #5488 DQ on my 340 build for cool factor and for power. Most material I've read states very little difference in power from DQ to single 4bl. I discovered the port size was a huge mismatch for the 340. That DQ was designed for 273/318. So I put it on the 273 and made my own progressive linkage pretty cheap. I started to run outta time and never got everything ironed out. I enjoy tinkering when it goes in my favor lol. This time it didnt. I pulled it off and put single 4bl back on. Next time it will go on with 273 as Commando, hopefully less time tinkering and more time giggling lol.
If you do it, I would say 85% for coolness.