no doubt my feedback is one-sided
Go with the Sheridan kit. I have the standard kit on my car and it it very streetable EXCEPT for the front spoiler area on steep driveways, but any decent spoiled front end on a 914 will want to scrape on a steep incline (like pulling into a gas station with a good incline). Even at an aggressive driving angle I have scraped the front corner. But I also had one of those air dams on the car before the conversion that had the rubber lower piece and it was beat to hell from scraping for the same reasons.
So, easy to fix - don't pull into aggressively ramped driveways. I have driven the car on the street a few times before stipping it back down and never hit the front by being selective on where I entered parking lots. For every steep driveway, there is typically a not-so-steep one around the corner. Never hit just driving around, even on a rough street.
And the Sheridan kit has great lines - much smoother than the GT stuff. Also can check my site - I cut the area out where the turn signals go and fit the stock assemblies in there. They slip in and out so I can remove the front end at the track, but you could fix them to be held in place like the stock vehicle.
I have "deep dish" wheels on the car as well and with no spacers, the 15x8-1/2" (only 4" backspace!) wheels with 245-50-15s fit really well and put 9" of rubber on the ground. The 245-50-15 Hoosiers hit the lips because they are wider (cantilever tire) so I had to trim them just a bit.
With deeper back spacing I could have easily had 10" rubber on the front and 11" rear. The "wide body" doesn't add a whole lot more room surprisingly - I think you can get 11s on the front and 12s on the rear, so only about another 1" IIRC. The wide body is slick if you get the one piece front and rear with integrated lids (assuming you never want to put your top in the trunk again.
For the tube car, I am probably going with 15x8 fronts and 15x10 rears (NASCAR wheels) with the 245-50-15s front 275-50-15 rears.
Roger is in Paso Robles, so an easy drive for you NorCal guys. Hell I drove from LA just to take pix of his car. And he is a great guy to talk to.
Bill (wberthgo) has a std kit on his V8 he streets all the time as well.
This pic is between engine swaps (why the rear is so high) and with BFG radials - you can see the deep wheels and 9" rubber fit no problem on the standard kit.