Rodney,
Here is the info I used to install a 502 in my original 307 Malibu:
This info is from http://www.energysuspension.com/prod1.html
***YOU WANT THE "TALL AND NARROW SIZE" MOTOR MOUNTS - to be used with
350-396+ cubic inches frame mounts. The mounts I removed from a '71 or '72
Chevelle have the part numbers stamped on the mounting flange. #3980712
pass. side & #3980711 drive side. Measure the mounts you have and compare
to the measurements from the motor mounts listed below. Is it possible that
you purchased 6 cylinder frame mounts ? Also, if your car originally had a
350 as the previous owner stated, it would seem very odd that they knew
about the different frame mounts and changed those out as well (?).
www.angelfire.com/tx/lonestarclassics/engine.htm
At any rate, hope this helps,
Kent
'68 Malibu ZZ502/502
ACES #5102
EARLY G.M. STYLE MOTOR MOUNTS
Performance Polyurethane "Early Style" Motor Mounts for 1963 to '82 Chevy 6
& 8 cyl. RWD cars
Fits 1963-'82 Chevy 6 & 8 cyl. rear wheel drive vehicles (both small and big
block) as well as 90%+ of the street rods "hot rods" with Chevy motors.
(Also fits Chevy motored hot rods.)
The first and only polyurethane motor mounts available with a (take
note) safety interlock, to effectively control high horsepower and torque!
They're high-performance, "bullet-proof" strong, yet as smooth running as
O.E.M./stock. Impervious to auto fluids. Your best and only alternative to
solid metal mounts! Choose from either chrome or zinc plated metal. Made
with HYPER-FLEXT performance polyurethane in black or several vibrant
colors. Great for show vehicles! --
CHECK YOUR MOUNTS- THEY MAY BE WORN! -- Call us or get our new catalog for
vehicle/engine applications, or see the illustration below and simply
measure your mounts to match the measurements shown. Two are required per
vehicle.
Two sizes are available-
At TOP- The "Short and Wide" type-- Zinc Plated # 3-1114 or Chrome Plated #
3.1115.
At BOTTOM- The "Tall and Narrow" type-- Zinc Plated # 3-1117 or Chrome
Plated # 3.1118
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