After my Sister's wedding (21st Jan 2006) I am contemplating buying a 180B (610) and transferring the engine, gearbox, engine crossmember, steering linkage ??steering box??, Lower control arms, and struts over to my July '75 120Y sedan known as "The Iron Maiden"... I intend to swap over the BW 68 diff (W/leaf springs -from my March '77 120Y sedan aka "The Defect" as the jap 120Y sedan leaves are softer than a pensioners turd!... and the H150 will make a distinct "BANG" sound if coupled up to an L18!

I am getting a little exited about the whole idea... but what are they like to drive? I intend for the L18 to be Stock As A Rock

what is the power to weight ratio like? V8 like?, V8 killer? or considerably faster than a A12-A15 powered car but not F1 like??

The H150 will only make a distinct 'bang' if you do stupid things to it. Is this the plan?

The H150 will handle reasonably spirited use without too much drama, but like any other automotive component, won't hold up to constant abuse. The engine choice is good, but how much power do you think a stock L18 engine makes?

105Hp stock as far as I understood...but I have a feeling that might be for the 180B SSS engine...

the plan is to thrash it - but not too hard - as it is my personal transport... I DO have a spare H150 centre... but it is an auto ratio...

However the Previous owner wasn't a Datsun Lover and Ruthlessly thrashed it... that is why I want to ditch the H150 that is in "The Iron Maiden" the PO has killed about 10- 15 302/351 Clevelands...

I had a 1981 XD ford falcon ute with a 170Hp XA (1972) 250 2V in it - 120 Km/h violent fishtails (on gravel) with Dad at the wheel... it still would run (if I could be bothered to put the 350 Holley back on itand put a battery in it!...
but it smokes like a locomotive...

but a hole in the radiator killed the fun!...

As far as I can tell, there were only two ratio's used in Australian H150 diffs. They are 3.9 to 1 & it was used in almost everything that had an H150 diferential, except for the A15 powered Sunny Sport Wagon which used a 3.7 to 1 ratio.
Auto or manual, it was the same.

Power figures are very hard to find for Datsun cars of this era & neither my factory manual, nor my Gregories manual for the 610 [180B] quote it, but the data plates that I have from several 200B models quote both 95hp [SAE] & 110hp [SAE] & these are L20B engines. If the lower figure is for the earlier model of 200B, then I guess that the single carb L18 would be a little less than this.