how do i swap a 2nd gen into a first gen (engine swap)
 

i have a 85 rx7 with a blown cooling seal.. im tryin to swap a 2nd gen 13b motor in it but wut do i need to do to make this work, with the mounts and stuff????

Have you looked at the FAQ at the top of the page?

https://www.rx7club.com/1st-generation-specific-1979-1985-18/1st-gen-rx-7-faq-page-237777/