I have a friend who has a 1995 Civic LX 4dr and it has a D15b7 in it. He wants to swap it out for a DOHC V-TEC. I was wondering if putting a B16A In it would be a good idea.

Yeah it's a good swap. Really depends on what his hp goals are and how much $ he's willing to spend. But the b16a is definently on the right track (that's why in Japan they come in Civics stock).