I have 2 R3 blocks tall deck Siamese bore 1 is 48° the other is 59° and I have 3 sets of W5 and 1 set of W7 heads. One 4.125 crank and two 4.00 cranks.
Sounds like you need to get on with the build lol. You’ve got ALL cool stuff.
That 48* R3 block should easily go 4.185 and probably will go 4.200 plus some. At 4.200 X 4.00 you’ll be 444 inches. At 4.200 X 4.125 you’ll be 458 inches. All of which I know you know. I just like the math.
