Using solid cab mounts on my pro-touring 69

[tranz am]

I'm at the point in my build where I will need some kind of cab mount. Im building this truck with drag racing / pro-touring in mind. I will have a fully boxed in frame and i will be installing a roll cage in the near future to further strengthen the truck, but not at the present time. My question here is will a boxed in frame be stiff enough alone to keep it from popping cab welds or cracking it if i use solid cab mounts? Since i plan to do a cage in the future and will be attaching it directly to the frame, I need my cab to stay put, thus the need for solid cab mounts. any input or experience with this would be great to hear. Thanks!