AD yes, in fact you can see the jack handle on the cowl in later pictures, I laid it right next to the right one and still didnt notice. :/
metalmaker, I like mounting my core support "soft", using bushings, so I plan to run a 1x3 inch rectangle all the way across the bottom of the cut and use bushings on the outside of the framerails. here is a picture of how I did it on my 49
your way sounds like it would work too though, although instead of coming up between the steering box just use L brackets on the top of the frame like the 47-55 s10 swap guys do.
have you seen that S10 swap how to? a lot of good info in there.
http://67-72chevytrucks.com/vboard/s...d.php?t=632686