[Mg-t] more td head questions

[KRISLYN COMPANY]

hello again
was talking with a gent from new england area that rebuilds TD's etc and he
indicated that there was a higher tensil set of head bolts made that allow
higher torquing of the head bolts thus perhaps better head to block
fittment...  both surfaces have been machined by a qualififed machinist as
flat,,  yet I have had trouble (4 gaskets to date fit and failed) ...does
anyone know of these "stronger" bolts availability?
thanks again
rocky