I can help with one of these questions.
Glow plugs are the diesel engine spark plugs. They only get used when starting the engine. Diesel engines rely on compression and heat to ignite the fuel. Glow plugs help get the fuel hot in the morning.
Others here can show you exactly what needs to be fabricated in order to put a diesel engine in a gas engine vehicle. Believe me, it is no piece of cake. Lot's of work and it may takes months and hundreds of hours of your time. I've done it, I know first hand.
Brian Rodgers

Brian Rodgers
Internet traffic relayed through DIY solar powered WiFi tower.
www.outfitnm.com
1989 Isuzu Pup gasser
2-86 Isuzu Trooper turbo diesels (1 good 1 bad)
Many gallons of biodiesel since 2005