Why not get a CSR carbon shield? That will take the place of your current shield and blanket. Those flexplate shields are always a PITA. I don't think any reasonably deep oil pan is gonna make your problem any easier. I'd either trim the K frame or get the CSR shield. twocents

A powerglide (wish I had one) or TH400 I understand, but a TH350?

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax