87 should be speed density. Upgrading it to a MAF EEC IV system will run a reasonable EFI equipped 351.
Intake, right distributor gear for the cam and block, injector size and a matched MAF are the ones that first parts that pop up. There is a swap thread for this.
detailing EVERYTHING needed on a 351W swap into a fox, someone whos done it step by step maybe? any help would be appreciated. ive done a search on here and heard about some sticky that isnt there anymore :rolleyes: so if someone could help me out, thanks