I have a 69 318 with no heads and also have a 67 273 engine. Can I use the 273 heads on the 318 along with the 318 hydraulic valve train? I'm trying to go cheap.
I would consider throwing in a nice mild cam while you are going this way, it will really improve performance.... A nice mild grind about .450" - .470" lift and run about 268° - 280° duration.... Basically upgrade to a stock 340 cam (268/276 with .429"/.444" lift) or just a little bigger, but not too much bigger...
I would also put a double roller timing chain on while you are in there, it's money well spent...
I have used this true roller double roller timing chain from Edelbrock for decades and on all my engines... It's one step over the stock 340 chain... I have run them over 100 k and they are still good with minimal stretch... The efficiency gain and long term durability of this chain will pay for itself over and over in the long run... Your timing will be more consistent...