It will probably run alright with those plugs but effiency will be down. The Go engines use the short threaded plugs and the Novarossi's are long threads, You will either need to use the Go plugs or the O.S. compatible plugs. For O.S. I would try the #8 or A3, o'donnel also makes a o.s. compatible plug and I would say try the 97 and 99 standard plugs. You can always get your local shop to set up an account with Racefactor Industries and then they will be able to carry the Go plugs.