If you don't need the PTO, an 8 HP Briggs will fit with a little frame work.
My L/60 Custom:
Or a 12-1/2HP Briggs with more frame work.
My 70 I "Industrial":
Both have used Briggs engines from old mowers, bought rather cheaply! ~~ Lowell
My L/60 Custom:


Or a 12-1/2HP Briggs with more frame work.
My 70 I "Industrial":


Both have used Briggs engines from old mowers, bought rather cheaply! ~~ Lowell