W2/W5/R3 Engine Build Opinions Needed

I would definitely go with the W5s over the W2s. No comparison in the two in my opinion. It Depends on how fast you want to go and how much money you want to spend for the blocks. I am running a best of 10:59 at 127mph in a 3000 lb car with the 360 W5 head engine I bought from BJR. The engine is a W5 360 .030 over, stock cast crank and rods with KB107 pistons. Comp cam is 248-254@50, 576/582 lift. I am shifting at 6200 and crossing the line at 6500 with 4:56 gears and 31" tires. With the good parts in the bottom end like you spoke of there is a lot more potential for the 360. I have about 80 passes on mine and it just keeps running stronger. Good luck with what ever you build.