Hi again. I am sure you guys are familiar with the shock towers in early 60's fords and merc's. Mostly the falconII style shock towers. Anyways i was think of getting rid of the shocktowers. I was thinking of building my own mounting points for the upper a-arms and lower control arms. These brackets would weld to the sub rail. I then would run tubing from the fire wall to the front of the rail. I would mount a coil overs from the tubing to the upper a-arm. I hope you follow me. I was wondering if the tin sub rail is strong enough. Or if I should make it almost a full frame car. With frame rails in the front and running all the way back to my Chris Alstin frame rails and four link.
Thanks in advance and I hope I was clear enough for you guys.

Okay, the last sentence of your post kind of answered the question for me. You note that you are running a four link, which probably means you are looking to make some substantial power and hoping to get it to the ground. This means that the car will be subjected to substantially more stress than it was ever designed to handle. If I were you, I would STRONGLY recommend tying the front and rear sections together. This will enhance the structural integrity of the vehicle. Also, keep in mind that this engine will rock and pull at the frame when it's all bolted in. This stress, coupled with the stress of traction from the four link and even slicks will eventually destroy a car that isn't properly prepared to handle such power and abuse.

Good Luck with your project.

Room for a big block?

There are kits for converting to tube/coil over suspension and tower cut outs.

NPD has them.

If you do fab your own, add torque boxes to better complete the triangle with tubing, the firewall is not strong