Dome pistons for 318 stroker

Hi, I have a dodge dart 318 stroker (396 pol -3,970 bore X 4,00 stroke), intended for drag race. My car is a dodge dart 79, and his weight is 2450 lbs, race ready. The cylinder heads are edelbrock, intake super victor, Hugues solid 268/272 0,50. The pistons are keith black flat top, 3970 bore, and compression is only 11.8, low, because the fuel is alcohol (metanol). I need dome pistons, I am thinking about 13.5 compression or more, and I'll use w-2 heads. Do you know where can I buy these pistons? I called Ross pistons, but the price is about US$ 900,00 or more, and the time to make is 3 or 4 weeks... I'd like lightweight pistons, and my rods are scat I beam. Do you know if Keith Black make these pistons? Thank you.​