there is a model of denso inj that fit. however, they idle like a bucket of crap rolling down the stairs.
as far as soldering goes, it isnt hard, but can be done wrong. all i do every day all day is solder and pretty good at it. however, the old crusty oxidized wiring under the hood isnt the easiest thing to solder. it can be done, and i have done several. but have yet to be 100% satisfied w/ the results. be sure you clean the wire as best as possible, use plenty of flux and good quality solder.