I'm going to thrash around with them for a while. I think they might be just enough of too much of a good thing
. I think the squirter volume (these have 25cc squirters x2 with 50cc pumps) as well as reduced accelerator cam profile will make them more civilized for street use.
I hadn't considered the lack of a power valve when considering jet changes. I may want to leave well enough alone, one step at a time. For the price it will be a fun exercise, I will keep the 450's handy though. They worked really well on the 428 with the hydraulic cam and are ok on the 427. There is just more to be had, of course that always comes at a price.
Thanks for the prospective. I will let you know how it works out.