Wonder why they used them type bolts?
If that was my head I would make or have
speedchaser make bushings and press into the holes then just use studs and nuts like OEM.
When you pressed in the bushings they could be loctited in.
Maybe Speedchaser could make a batch of that style heads for the 350?
Post up some pics so the guys know what head your talking about
Measure again but I think these will be the length of studs you will need, actually they are 5mm longer they didnt show 90mm
http://www.partzilla.com/parts/detail/h ... 95-30.html