I for one think your '86 looks good with the quad round headlights. Seems like you took your time and did a good job on the conversion. Whatever floats your boat. It's a super clean car from what I can see, so you'll probably regret any mods less in the future if they are reversible...
I would look for a relatively low mileage B23 or late model '93-'95 B230 in the junkyards for your '79. They are still plentiful - and don't forget to look in 700 and 900 series cars too. You could get a B230FT from a 740 or 940 turbo, complete with ECU/EZK and all the intake, exhaust and smog-related stuff, and do a legal engine swap. You take it to a "BAR referee" and if everything looks stock from the donor car, you get a sticker and the car gets smogged legally. There are a few more restrictions, but that's what I'd do.
http://www.bar.ca.gov/80_barresources/07_autorepair/engine_change_guidelines.html