08 Honda Civic Engine Swap or Just buy new/used car?

I was a victim of hit and run and never caught the culprit. My car is totaled but the engine is perfectly intact and undamaged. I have a 2008 Honda Civic EX-L with only 96k Miles on it. If i was to buy another civic of the same generation or shell and do an engine swap how much would it cost for the engine swap job? Or should i forget about it and just move onto purchasing a new or new used car?

What is causing Honda Civic rough idle?

My 2006 Honda Civic w/ 1.8l engine has a rough idle. I replaced the passenger motor mount and spark plugs, but no luck. When warm it idles around 550-600 rpm and will dip down to 500 or even lower. It feels like it is about to stall, but goes back up to 550-600, like a hiccup. I checked the air filter and it was clean. I cleaned the MAF sensor, but no measurable difference. The old spark plugs were a little dark (dry soot). Just noticed valve cover is leaking too. Car was sitting for a few months. No check engine light. My next move is to replace the valve cover gasket and clean the throttle body.

Is this car supposed to sound this way? Its a turbo civic del sol 1995 for sale on Craigslist in NC. The motor seems to have a tick?

I'm looking at a 95 civic del sol turbocharged for sale for only $3500 seems like a really good deal except in the video the motor seems to be ticking at idle its very loud and I texted the guy about it he said that its normal because its a built motor with lowered compression. Anyone know about built Hondas can verify is this true? Here is the craigslist ad and the youtube video of it (which is also linked in the ad)

https://raleigh.craigslist.org/cto/d/1995-honda-civic-del-sol-si/6628041691.html

How much is my used car worth?

I have a 2004 Honda civic ex v tec that i'm trying to sell as is. However it does have some issues but i'm not sure how much its exactly worth. The right side passenger and back seat doors have to be locked manually(by hand) it has been in a accident before as well. When ever i drive at night sometimes the headlights flicker i don't know if its an electrical problem or not it does not happen all the time. It has 239,000 miles on it. One of the rims is mismatched. The check engine light is on too but its a sensor i got the code read at auto zone so its a minor issue. It comes with a sound system and tinted windows. The tags expire next month. Not sure how much its worth so does anyone have any ideas?