As output transformer has been choiced the Lundahl LL1627/185mA with secondaries connected in B configuration 
to have a primary load impedence of 2.3K on 8ohm load. so each EL34 will have a load of only 2300 * 4 =  9200ohm.

The LL1627/185mA have a primary inductance of 9H and the EL34 have a nominal plate resistance about 910ohm 
and four 910 / 4 = 227.5ohm so in theory the low frequency cut-off will be egual to Ra / ( 2 * pi * 9H) = 4Hz (-3db).

Using the LL1627/185mA each EL34 will be set with a bias about 185 / 4 = 46.25mA that produce at 430V 
an anode power dissipated of Pa = Va * Ia = 430V * 46.25mA = 20W that is very less than EL34 max power.

You could request without any problem to Lundahl a custom LL1627/220mA or a 240mA to increase 
the Ia to 55mA or 60mA per each EL34 but there is no advantage.