MGB engine ID

[Larry Moeller <elmo@inreach.com>]

i just opened up a 1800 5-main i bought from a wreck a few yrs ago &
need some help ID'ing the parts:  Crank is cross drilled & balanced,
marked "REX Race Eng"; cam has # H374 on nose, bore is 040.. car was in
Sacto CA area, suspect maybe engine built by Bob Yarwood who was in
Diamond Springs at the time.. Anyone recognize these & have any help on
the cam specs & source (it ate the lifters.. otherwise engine shows very
little wear).. it is going into my 62 B vintage car..

Larry