Crossmember rivets

[50bomb]

I have a 1965 Chevy c20 that I’ve taken out the original 3 speed manual. So far I have grinded out the lower rivets on the brackets and now I need to on the upper. The angle grinder doesn’t fit in between the frame. I don’t want to use a sawzall because I want to save the transmission crossmember. I used a dremel but was unsuccessful and blade just tore up. Those rivets are savage. Please let me know if there is a good electric grinder with cord that will do the job. Thank you
Posted via Mobile Device