No offence, but I think a swap like that might be a little over your head. I should give you a ride in my truck some time with my SM465. You should drive it too to get a feel for it. Personally I love it!

I could never go to an auto. My boss's 89 Chevy van has a 305/700r4 combo and it sucks, not to mention its a dog, if you put the pedal to the floor the trans shifts way too soon, the engine never sees above what feels like 3000rpm

. With my 465 I have total control over whne to shift so my engine can readily see about 5000rpm (that's where I like to shift when I got the pedal to the medal

) I accidantly pegged the engine out to 6500rpm

now my red line is about 5250rpm, that was a result of full throttle/doing donuts in the snow and ice.
Now to get back on track, if you have the means, time, tools, $$, not to mention patients, then I really supremely recomend doing it. You won't regret it.