Larry,
The factory assembly manual Section 6 Sheet 2.00 shows an L bracket from the oil pan approximately just below the location of the #5 spark plug. I personally have mounted a bracket on the steering box as it is more directly in line with the clutch linkage. Either way would work fine.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine