wow , great job , i've got one just waiting for me , 340 four bolt main engine w/auto , air ps , pb , now factory disc . going to convert to a 4spd od . i bought my many moons ago , did the motor over , then is when i found the windage tray with the four bolt mains factory block . could it been a special order ? no fender tag or rear seat build sheet . and drums to stop with , that change happened right away . she is loaded with air , ps , ect... why four bolt mains ? back to yours , i dig it ! great job again , look forward to seeing her done .