If you want "350ci, flowmasters, big tires on back, rake, stock insides and air conditioning" why don't you sell the old suburban to to someone who will like it for what it is and buy yourself a later surburban?

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.