i went through this same scenario a year or so ago because i want to modernize my truck so i can drive it anywhere. I even bought a reg. cab short box s10, stripped it down to a rolling chassis, and was dead set on going this route. the wheel base on said s10 is so close that is had to work, but i ended up scrapping the idea because the s10 frame is shaped really funny compared to the original frame. I figured that after all the modification needed to make it "work" i could box the front half of my existing frame and install an IFS from something else.
if you are looking to stay on the economical side i would buy a v8 1980s dodge diplomat/volare/mirada type car and transplant the whole subframe, motor, and trans. I have seen this done and talked briefly to the guy that did that. he like the truck a lot and said it handled great. Or you could go a different route by not using the mopar drive train and just use the subframe from that type of car. This is what i chose to do next accept my motor's starter is on the wrong side compared to the mopar v8 so it interferes with the steering box. so at this point i have $800 wrapped up in trial and error but thats how we all learn.
Ive also seen Jaguar front subframes used in different applications, along with the previously mentioned dakota frame but i dont know anything about them.
So right now im sitting with a truck on jack stands and im looking into other ifs options. im leaning towards a kit from Fat Man Fab but they spendy, however i would have half of it paid for already if i would have just gone that route to begin with. Ive called them and they have specs listed for pilothouse trucks so it should be a fairly straight forward install.
Just my $.02 on the subject but i would stick with your stock frame and modify from there