Nice man it's a nice clean start. Definitely keep and rebuild the B17. Of course, a K-series can and will make more power, but it would be worth a LOT more with the B17 due to the rarity of that motor. Especially if it's the original, numbers matching engine. Wow I didn't even notice at first that it was even a GSR!
Well good luck and be sure to stick around and keep us all updated man we LOVE to see builds!