I say do a mild build on the D. Maybe a low boost daily driver. Only why I say this is because, its like everyone usually goes with a LS swap. Not saying they're not good swaps. Just, that they are to common.... Just my opinion. But then again, I know they're some nice D-series cars out their. Just seems not as common as the B-series. Or, you could do a NA D16 mild build to have some alright Hp & Tq for a DD street car. Correct me if I'm wrong, but the OEM pistons out of a 1st gen integra will raise your compression up close to the Type-R compression. Already a power adder their. Then maybe a cam, intake mani, and some simple bolt-on's and you're set.