Pick a block

Pre Magnum 360 roller
Build intent? Everything and anything. Mild to hair raising wild.
My imaginary block. Same as above only a 340 main, with the ability for a safe 4.250 bore. Siamese cylinders please!
Build intent, same as above.

The Magnum block is a newer & stiffer better machine and probably faster block with tall lifter bores with plenty of meat around them.