Timing Gear Drive
It's just 2 holes that need to be drilled and tapped, no big deal. I just bought one off fishy68 for my 360. I ran a Pete Jackson noisy gear drive on a 350 that I built when I was 13 and loved it. Last I heard that motor ended up in a Toyota pick up.
From the CAT website...
INSTALLATION OF GEAR DRIVE TIMING SET
MOPAR 318/331/340/354/360/392 PLATE MOUNT THREE (3) GEARS DRIVE INSTALLATION GUIDE
1, Place the idle gear mounting plate on the cam retainer and loosely tight the bolts.
2. Place cam and crank gears on the cam shaft and crank snort.
3. Drill additional bolt holes follow by the bolt holes pattern on the mounting plate
with 17/64 bit at engine block from two bolt holes at mounting plate lower side to
0.750 deep.
4. Tap both holes with 5/16-18 tap and clean the holes thoroughly.
5, Install supplied 5/16 bolts at the new bolt holes and torque to 20 ft-lbs.
6. Install cam gear and torque the thrust bolt to 45 ft-lbs.
7. Place a news paper between all gear teeth to ensure proper backlash maintained.
8. Engine Timing:
a. Install damper on crank and set NO.1 cylinder at TDC position.
b. Using Cam maker specification to find No.1 intake opening degree and move
crank to that degree.
c. Place a dial indicator on top of valve to ensure the lift of cam specification has
reached.
For example, if the cam specification indicates the intake opens at 39º with
0.50 lift. Turn the crank to 39º with dial indicator show a 0.050lift reached.
d. Mark on the cam gear this is a 0º timing mark for the cam gear. Install
cam gear bolt.
9. You can advance or retard the engine timing by position the crank gear key way
in 5 different positions according to the timing chart supplied by cam maker.