69' Dodge Dart Resto/Upgrade in NY

Well, finally got the word from the machine shop that the 440 block is good to go!
About to place order on thousands of dollars for parts from 440 source (trying to keep the engine build around $10k).
500 cubic inch stroker kit, Trick Flow 240 heads and RPM intake.

Question: I figure on making 550 to 600HP with this motor (maybe a 150hp shot of nitro down the road). Would just welding in subframe connectors be enough for body/frame to handle the power or would I need more?
*This will be mainly street driven but I intend to participate in events like Drag Week.