Well the B16 does like turbo but it is the Tq'less wonder! Your best bet is to take that B16 head you have there and put it on top of the GSR block. You now have a poor mans type-R. The B16 head flows very well with out much work! Now, you turbo that and BAM!!! Either way you will need to build it!

Both motors are great and will do well with a turbo. As far as getting 500 hp goes, that will be up to the turbo you get and the stuff you use to get it there. Either one can do it!