I'm doing a engine swap for my honda and i was thinking about selling my SOHC. It has 147,000 mi on it. How much do you think it's worth?

 

depends what model

d16z6 complete swap with trans- 250ish
d15xx -100ish
d16y8 -300ish
d16yx -100ish
d16a6 -200ish

those are just rough estimates and based on my opinion of what a "fair" price is for those swaps.