Beginner Road Track Racing: Feedback on Engine Options Wanted

Option A would be my choice. The cast crank will be fine well beyond the limits of your hyd roller. You want a WIDE powerband, not a peaky one. LA 360 pistons in the magnum block will reduce or possibly eliminate the need for deck cutting. The magnum is slightly shorter than the LA, deck height wise.
Thanks. My hope in using the Magnum block would be to eliminate the need for decking since for this build I'm not concerned if the piston is down within reason. I'm trying to squeeze out every bit of HP, so saving on machine work lets me put more budget toward suspension, brakes, etc.