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I wouldn't worry about wallowing out the frame holes as you'll break that nice aluminum head first( add it won't be long) when it does fail, youll be on the gas, and a heart beat from looping the car from the pressurized coolant that will be expelled---
If you don't or can't used thru bolts in your motor mounts, use either chain or cable with a resonable amount of slack. The direction your link is mounted will transmit vibrational plus torque forces into both the frame and head---and everything on your car is going to vibrate
If you want to use a solid link---mount it horizonal so gravity doesn't have an effect and choose a location that like yours is against rotational forces--of course then you will probably have a certain amount of throttle steer introduced
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