EN todo caso para que no deseches la idea, aqui hay un wen link para estudiarlo...
http://www.cruzers.com/~twakeman/LR/V8Conversion.htm
Choosing and setting up a small block Ford engine
Since the small block Ford engine has been in production since 1964 you have a wide choice of engine sizes and configurations available. I have found that a basically stock 302 has plenty of power to do anything I ask of my 5,600 pound 109. I never gear down on highway grades, can easily climb any slope that my tyres can grip and go through deep sand without bogging to a stop. While a 351 engine is an option, I feel it is overkill unless you plan on pulling a big trailer up long steep grades.
The primary difference between a 302 and a 351W is the block's deck height. The 302 is 18-2/3 inches wide and 20-3/4 inches high. The 351W is 21 inches wide and 23-3/4 inches high. They both have the same length. The 351 is a tighter fit but if the engine is centered in the frame you should have plenty space to change the left rear spark plugs. Converting to Defender front wings would provide plenty of space to get at the plugs in a 351 conversion.
My engine is a
302 that was first used in a 1970 Mustang. With a stock cam and 500 cfm four venturi carburetor, I estimate a bit over 200 HP at around 4,200 RPM and about 300 lb-ft or torque around 2400 RPM.
The peaks occur in the same RPM range as the LR four cylinder engine